When I first got the CMT-340s and stands, I just assembled per instructions and didn't think much of it. I haven't filled them yet, though the litter solution will likely be happening soon as I do hear a bit of resonance. That got me thinking about the feet. The theater is in a 2nd floor bonus room over the garage, so suspended joists and the like. Carpet with an 8lb pad. When I set them down, I could hear the spikes poke through the carpet base, but now I've started wondering if that's the best approach or take the spikes off and let them float a bit on the carpet. I'm also at least a tad concerned about 70-80lbs on spikes on carpet and if that might do any damage. Any suggestions on the best approach?